Hi everyone - styles are now supported on mobile, including styles for all new native mobile elements like Selectable List, Top App Bar, Tab Items, etc. You can create new mobile styles from the element property editor, or the styles tab itself.
In addition, we’ve added some new UI to manage elements that are compatible with both Web and Mobile. In addition to the platform compatibility filter, the preview canvas has a mobile and web toggle and the property editor will now call out web / mobile specific settings in addition to all shared settings.
This walkthrough video goes into more detail.